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Multifamily HVAC

HVAC Systems for Multifamily and Mixed-Use Projects

3rdGen Building Systems supports multifamily and mixed-use HVAC scopes where repeatable unit layouts still need project-specific coordination, ventilation planning, equipment access, and construction sequencing.

We help project teams deliver consistent unit-level mechanical work that still fits the building, the trades, and the construction schedule.

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CA Lic 1086898 • Bay Area multifamily & mixed-use HVAC • Licensed & insured

Project Inquiry

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Share project location, timeline, drawings if available, and a short description of the HVAC scope. We will review and follow up.

Capabilities

Built for Multifamily Mechanical Work

  • Unit Layout Review

    Review unit plans, equipment locations, indoor placement, ventilation needs, and routing constraints across repeated layouts.

  • System Planning

    Heat pump, ductless, VRF, ventilation, and distribution strategies based on project needs and building conditions.

  • Plan-Spec + Design-Assist

    Price and build from issued drawings, or support the team while equipment and routing are still developing.

  • VRF + Multi-Zone

    Multi-zone systems where independent control, piping flexibility, or concealed equipment fits the building.

  • Ventilation Coordination

    Outside air, exhaust, and make-up air coordinated with unit plans and common-area requirements.

  • Installation + Closeout

    Repeatable field execution, startup, verification, and closeout aligned with the GC schedule.

Multifamily Work

Built for Repeatable Systems That Still Need Coordination

Multifamily HVAC needs consistency across units without ignoring the constraints of the actual building.

Unit layouts, ventilation, equipment locations, access, routing, electrical coordination, and sequencing all affect the final scope.

3rdGen handles multifamily projects where HVAC needs to be planned around both repeatability and buildability.

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3rdGen technician coordinating spiral duct installation during a commercial retail tenant improvement

Unit Layout Review

Review unit plans, equipment locations, indoor unit placement, ventilation needs, and routing constraints across repeated layouts.

System Planning

Support heat pump, ductless, VRF, ventilation, and distribution strategies based on project needs and building conditions.

Construction Coordination

Coordinate rough-in, equipment access, electrical needs, sequencing, and trade interfaces with the GC and project team.

Installation and Handoff

Execute the mechanical scope with attention to repeatability, workmanship, startup, service access, and closeout requirements.

Unit-by-Unit Execution

Practical Execution Across Repeated Units

Multifamily HVAC is not just a set of repeated installations.

The system needs to be coordinated around the building, the trades, the schedule, and the long-term service needs of each unit. 3rdGen brings a project-based approach to scopes where consistency, sequencing, and access all matter.

  1. Unit-by-unit layouts

    Keep repeated layouts aligned while accounting for stack conditions, shaft space, and field variations.

  2. Equipment locations

    Place indoor and outdoor equipment where they can be installed, serviced, and maintained over time.

  3. Ventilation requirements

    Plan outside air, exhaust, and make-up air across units and common areas as the layout requires.

  4. Routing and condensate

    Coordinate refrigerant lines, duct paths, and condensate drainage through chases, ceilings, and structure.

  5. Electrical coordination

    Align disconnects, panel capacity, and rough-in timing with the electrical scope and unit turnover.

  6. Startup and closeout

    Verify operation unit by unit and support inspection, punch list, and turnover with the GC.

3rdGen technician servicing a Mitsubishi Electric rooftop unit during commercial tenant improvement HVAC work

Typical Scopes

Multifamily HVAC Scope

  • Small to Mid-Size Multifamily

    New construction and renovation scopes where unit count and building size stay manageable for a focused mechanical team.

  • Mixed-Use Buildings

    Commercial and residential occupancies where zoning, ventilation, and equipment placement need to work together.

  • Apartment Renovations

    Unit-by-unit or building-wide upgrades with phasing, access, and existing-system constraints.

  • Heat Pump Systems

    Central and unit-level heat-pump strategies for electrification and all-electric multifamily projects.

  • Ductless Systems

    Ductless and hybrid approaches where duct routing is limited or unit layouts vary.

  • VRF Where Appropriate

    Multi-zone VRF when independent control, piping flexibility, or concealed equipment fits the building.

  • Ventilation Coordination

    Outside air, exhaust, and make-up air coordinated with unit plans and common-area requirements.

  • GC-Led Multifamily Work

    Mechanical subcontracting within GC-led schedules, bid packages, and trade coordination.

Process

From Unit Plans to a Buildable Multifamily Scope

Multifamily mechanical work requires constant translation between unit layouts and field conditions. Our process is built around finding conflicts early, clarifying the scope, and keeping the work coordinated as the project develops.

  1. 01 — Review

    • Unit plans and stacks
    • Mechanical drawings
    • Existing equipment
    • Site and roof conditions
    • Code and ventilation requirements
    • Project schedule
    • Scope boundaries

  2. 02 — Clarify

    • Standard unit versus variations
    • Equipment responsibilities
    • Routing and shaft use
    • Ventilation and exhaust
    • Controls scope
    • Electrical requirements
    • Phasing and turnover
    • Coordination items

  3. 03 — Coordinate

    • GC
    • Architect
    • Mechanical engineer
    • Electrical
    • Plumbing
    • Fire sprinkler
    • Structural
    • Controls
    • Equipment suppliers

  4. 04 — Build + Turn Over

    • Procurement
    • Rough-in and setting
    • Inspections
    • Startup
    • Controls verification
    • Punch list
    • Closeout

Unit Integration

HVAC That Works With Unit Layouts and Common Areas

Multifamily mechanical systems compete for the same limited space as structure, lighting, plumbing, fire protection, ceilings, and architectural finishes—in every unit and in shared building areas.

The goal is repeatable installation details that still perform properly and integrate cleanly into the finished building.

We coordinate around:

  • Ceiling heights and soffits
  • Equipment closets and pads
  • Shafts and chases
  • Balcony and facade penetrations
  • Roof and yard equipment
  • Indoor unit placement
  • Diffusers and grilles
  • Lighting layouts
  • Access panels
  • Sound and vibration
  • Common-area ceilings
  • Architectural finishes

Field Verification

Existing Multifamily Conditions Matter

Retrofits and renovations inherit prior mechanical decisions—often without reliable documentation.

Mixed equipment generations, abandoned risers, undersized electrical service, and unit layouts that no longer match the original design are common. We verify what is actually in place before the scope depends on it.

What we verify first

  • Unit equipment & controls

    Installed equipment, available capacity, zoning, and how each unit is controlled today.

  • Risers & distribution

    Main distribution, duct or piping paths, and whether they still fit repeated unit layouts.

  • Ventilation & exhaust

    Outside air, exhaust, and make-up air paths across units and common areas.

  • Roof, yard & power

    Equipment placement, electrical service, and structural support for system changes.

  • Access & phasing

    Service clearances, occupied-building constraints, and how verification fits turnover or staging.

  • Drawings vs. field

    Record sets checked against shafts, equipment rooms, and conditions in representative units.

Systems

System Types We Work With

Project Types

Multifamily Project Types

Multifamily Residential Apartment and residential buildings with repeated unit layouts and shared infrastructure.
Mixed-Use Buildings combining retail, office, parking, or other uses with residential units.
Apartment Upgrades Building-wide or partial upgrades with phasing and occupied-building constraints.
Unit-by-Unit Renovations Renovation scopes executed across turnover or staged access.
Developer-Led Projects Ground-up or major repositioning work with developer schedule and budget drivers.
Existing Building Retrofits Modernization of aging systems within existing envelopes and infrastructure.

Project Teams

Built to Work With the Project Team

Shared audience pages explain how 3rdGen supports each role — from scope review and submittals through installation and closeout.

  • General contractors & estimators
  • Architects & design teams
  • Mechanical engineers of record

Each audience page explains how we support that role — from scope review through field execution.

  1. 01 For General Contractors

    Preconstruction, bidding, submittals, RFIs, coordination, installation, schedule, punch, and closeout.

    Mechanical scope that stays aligned with the GC schedule — from plan-spec bids through field execution.

    Mechanical Support for GCs

  2. 02 For Architects

    Early mechanical input, constructability, equipment coordination, and architectural integration.

    Practical mechanical feedback before routing, access, and visible components are locked in by field conditions.

    Coordination for Architects

  3. 03 For Engineers

    Execution of engineered designs through startup, TAB/commissioning support, and closeout.

    Submittals, RFIs, field coordination, and controls-ready installation aligned with the engineer’s design intent.

    Working With Engineers

Selected Work

Multifamily & Mixed-Use Mechanical Projects

Selected Bay Area multifamily, mixed-use, and repeated-layout mechanical work.

View all work

Common Questions

Multifamily HVAC Questions

Unit layouts, VRF, heat pumps, ventilation, phasing, and GC-led multifamily scopes.

Do you install HVAC for new multifamily construction?

Yes. We support small to mid-size multifamily and mixed-use projects where unit layouts, ventilation, and equipment coordination need a buildable mechanical scope.

Can you work on unit-by-unit apartment renovations?

Yes, depending on the project. Access, phasing, shutdowns, and repeated installation details are planned with the GC and project team.

Do you install heat pumps and ductless systems in multifamily buildings?

Yes. Heat pumps, ductless systems, ducted splits, and VRF can all be appropriate depending on unit layout, electrical service, and project goals.

Do you install VRF for multifamily projects?

Yes, where zoning, piping flexibility, and equipment placement fit the building. We also deliver dedicated VRF scopes on our VRF service page.

Do you coordinate ventilation and exhaust?

Yes. Outside air, exhaust, make-up air, and related ventilation work can be incorporated into the multifamily mechanical scope.

Can you bid from completed plans?

Yes. We perform plan-spec mechanical construction and can price multifamily HVAC from issued drawings and specifications.

Do you work as a subcontractor to general contractors?

Yes. We routinely work within GC-led schedules on estimating, submittals, coordination, installation, startup, and closeout.

Can you work in occupied buildings?

Yes, depending on the scope. Noise, access, phasing, and tenant impacts are addressed during planning.

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Planning a multifamily mechanical scope?

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Project Inquiry

Planning a Multifamily Mechanical Scope?

Send the project location, timeline, drawings if available, and a short description of the HVAC scope. We will review the project and determine the appropriate next step.

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